Pipe coupling



FIG. 1 is a perspective view of a first embodiment of our design for apipe coupling;

FIG. 2 is a side view of the pipe coupling shown in FIG. 1, the oppositeside, the top and bottom views being identical thereto;

FIG. 3 is an end view of the pipe coupling shown in FIG. 1, the oppositeend view being identical;

FIG. 4 is a perspective view of a second embodiment of our design for apipe coupling;

FIG. 5 is a side view of the pipe coupling shown in FIG. 4, the oppositeside, the top and bottom views being identical thereto; and,

FIG. 6 is an end view of the pipe coupling shown in FIG. 4, the oppositeend view being identical.

The broken lines shown in the various Figures are shown for illustrativepurposes only and form no part of the claimed design.

The ornamental design for a pipe coupling, as shown and described.